package com.atguigu.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired
//    private CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithThree() {
        List<CategoryEntity> all = baseMapper.selectList(null);// 所有

        // 写成树形结构
        List<CategoryEntity> level1Menus = all.stream().filter(
                        categoryEntity -> categoryEntity.getParentCid() == 0).map(menu -> {
                    menu.setChildren(getChildrens(menu, all));
                    return menu;
                }).sorted((menu1, menu2) -> {
                    return (menu1.getSort() == null ? 0 : menu1.getSort()) -
                            (menu2.getSort() == null ? 0 : menu2.getSort());
                })
                .collect(Collectors.toList()); // ok


        return level1Menus;
    }

    /**
     * 自己写的
     * @param asList
     */
    @Override
    public void removeMenuIds(List<Long> asList) {
        // TODO 判断其他地方有没有限制
        baseMapper.deleteBatchIds(asList);
    }

    // !!
    @Override
    public Long[] findCategoryPath(long catlogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catlogId,paths);
        Collections.reverse(parentPath);// 得到的是逆序的


        return parentPath.toArray(new Long[parentPath.size()]);
    }
    // eg  225,25,36
    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid() != 0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

    // 递归找菜单的子菜单
    // 从all里。找root的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return (menu1.getSort() == null ? 0 : menu1.getSort()) -
                    (menu2.getSort() == null ? 0 : menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

}